Mass-Energy Equivalence MCQs

Prepare for Mass-Energy Equivalence MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

19 Solved Questions • 15 Mins Practice • Updated for 2026 Competitive Exams
MCQS
2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Relativity & Cosmology on McqsMind. This comprehensive set offers solved multiple-choice questions with answers, detailed explanations, and authentic past-paper style questions aligned with the latest syllabus of Relativity & Cosmology (Physics).

100% Verified Answer Keys CSS, PMS, FPSC, PPSC, NTS Ready 2026/2027 Syllabus Guidelines

Direct Definition & Conceptual Scope

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Mass-Energy Equivalence constitutes an essential examination topic within Physics, evaluating theoretical principles, historical context, and practical problem-solving applications. On MCQsMind, candidates practice verified past-paper solutions, conceptual breakdowns, and syllabus-aligned questions tailored for CSS, PMS, and competitive screening examinations.

Solved Questions

Practice with answers, explanations, and exam-focused revision notes.

19 MCQs Page 1

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Topic Notes: Mass-Energy Equivalence

Quick Revision 2 min read 14 key points
Section 1 of 4

1 1. Fundamental Concept of Mass-Energy Equivalence

4 points
  • Definition
    Mass-Energy Equivalence: The principle stating that mass and energy are interchangeable, governed by the equation E=mc², where E is energy, m is mass, and c is the speed of light in a vacuum.
  • Theory Jan 1905
    Einstein's Postulate (1905): Albert Einstein proposed that mass is essentially 'congealed' energy, meaning any change in the energy of a system results in a corresponding change in its mass.
  • Fact Jan 2024
    Speed of Light (c): The constant value of approximately 3.00 × 10^8 m/s acts as the conversion factor, explaining why a tiny amount of mass releases a massive amount of energy.
  • Definition
    Rest Mass: The mass of an object measured in its own rest frame; according to equivalence, this represents the intrinsic energy content of the object at rest.
Section 1 / 4
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2
One kilogram is actually mass of platinum-iridium alloy cylinder kept at International Bureau of Weights and Measures in France. The ratio of platinum and iridium is:
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3
If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should
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4
The energy of X-rays depends upon
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5
What is the rest mass of a photon ?
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6
When the prongs of a tuning fork is filed, its frequency:
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7
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8
An oil drop of mass 1 × 10^-15 kg remains stationary in the air space between two parallel metal plates at a P.D. of 200 V and 3.2 mm apart. Then the charge on an oil drop is
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9
The density of zinc is 7.13 gm/cm3 and its atomic weight is 65.4. Its Fermi energy is given by (The effective mass of a free electron in zinc crystal is 7.7 × 10^-31 kg and the Avogadro's number is 6.02 × 10^23 atoms/gm atom)
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10
Zahid consumes energy of 800 J while bringing out a body of mass 40 kg from a dig. Calculate the depth of dig (g = 10 m/s^2).
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Pedagogical Syllabus Blueprint

Mass-Energy Equivalence MCQs: Preparation Strategy & Exam Blueprint

Examination Weightage & Commission Distribution

In Pakistan's premier competitive examinations—including the Federal Public Service Commission (FPSC General Recruitment & CSS MPT), Punjab Public Service Commission (PPSC Lecturer, Tehsildar & PMS Screening), KPPSC, SPSC, and BPSC—questions derived from Mass-Energy Equivalence MCQs consistently constitute a decisive 10% to 25% weightage of the Relativity & Cosmology paper. Testing agencies frequently evaluate both foundational factual recall and deeper analytical comprehension, requiring aspirants to master key dates, statutory articles, constitutional clauses, and thematic definitions.

High-Yield Conceptual Pillars & Distractor Analysis

Historical trend analysis across past five-year examination cycles demonstrates that examiner traps frequently involve closely matched numerical alternatives, chronologically contiguous treaties, and semantic subtleties in statutory phraseology. When preparing Mass-Energy Equivalence MCQs, candidates must deliberately review the underlying rationale provided for every question rather than merely memorizing raw answer options. Understanding why incorrect distractors fail is the most reliable predictor of achieving top percentiles in computerized and optical mark recognition (OMR) screening tests.

Negative Marking Mitigation & Time Management Protocol

For examinations enforcing negative marking penalties (such as PPSC's 0.25-mark deduction per erroneous response or NTS gatekeeper quotas), an aggressive elimination technique must be deployed. Candidates should systematically rule out improbable options first to elevate probability thresholds from 25% to 50% or 100%. Allocating an average of 45 to 60 seconds per item during mock trials builds the psychological stamina and cognitive precision required to complete 100-question papers within official 90-minute time limits.

Recommended Reference Sources & Statutory Reading

To achieve definitive conceptual mastery in Physics, candidates are advised to cross-reference our solved explanations with primary gazettes, statutory texts, and canonical academic textbooks. Verifying controversial questions against authentic official repositories guarantees that prospective civil servants and professional candidates present incontestable answers during both optical paper evaluations and viva voce departmental interviews.